Organic compounds that contain two hydroxyl groups (OH) attached to different carbon atoms.
From Greek 'di-' (two) + 'ol' (from alcohol, meaning hydroxyl-bearing), where the root comes from Arabic 'al-kohl' (a fine powder for eyes).
Diols are like the chemical handshake between alcohols and polyesters—ethylene glycol is the most famous diol, and it's the antifreeze that prevents your car engine from freezing in winter and overheating in summer!
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